Some features that have been requested, with commentary if I've thought about it. These are all very speculative and a long way down the road from where we are today.

Intervalometer in Movie Mode: 1 single frame
In order to preserve shutter and mirror box from wearing too fast, would it be possible to record 1 single frame of a continuous video file everytime the intervalometer count takes the pic? This would preserve the camera, give a better resolution than the silent mode and automatically create the final movie withouth the need of an external editing program. Alternatively, keep the mirror locked up during the whole sequence, would help a little.

Adding 2 more presets in intervalometer: 72 and 75 seconds
It may seem stupid but the two new presets would save a lot of time on calculating the resulting lenght of a time laps recording: the first one is 2 secs/hour at 25fps, the second records 2 secs/hr at 25fps. At the moment there is nothing between the minute and 2 minutes.

Recording mode: 2048x1152 2K 1.77 HD

1080p movie crop funtion

Increase the ammount of stops for taking HDR images from 9 to 21 (or more?)

recording cropped 1080p from the sensor without line skipping the whole chip

Speaking of increased mbps, how about options for a higher frame rate? (e.g. 1920 x 1080 x 120p, 1920 x 1080 x 60p, 1280 x 720 x 120p)

Shooting In true 1828 x 1556 with 2:1 anamorphic with raw 14bit from camera 4:2:2 would be the best feature that this camera can offer I would say just the best magic lantern can do for the film makers and people are desperate to use the output to film one can do post dpx conversion for final delivery in any compositing softwares. Remap the Scroll Wheel to adjust ISO as opposed to shutter speed.

High 4:2:2 Profile (Hi422P) h264 recording. 10 bits, 4:2:2.

Overall data rate stays as is, but bandwidth is allocated to 10 bits and 4:2:2.

Custom Format recording like 2880 x 720

so we can use a 3D lens an record true stereoscopic 720p for instance, do you think this is possible?

Increased compression bitrate to 100 Mbps, or ideally 280 Mbsp.

This would truly make the Canon DSLRs competitive with digital cinema cameras such as the Red One.

Increased recording time, either through increasing the file size, or linking multiple files into one clip.

Recording video to a USB device.

"Master" - "Slave" function to sync the exposure of 'n' Canon 5D

A fix for the red dot in the 7D HDMI output. Just move it up a bit into the masked area at the top o the screen.

Live full-res HDMI output

Very likely. A test using Sobel edge detection is in the source code.

720p mode

unlikely, based on the sampling rate of the sensor. Perhaps combined with crop mode it might work (cf. the Sony EXilim)

Auto-splitting at 4 GB file size

it appears to do this; we just need to display it. This is a good first project for someone who wants to get into developing for Magic Lantern.

Headphone output on the A/V jack

While recording video it would be great to record the lens focal length and settings to a meta data file.

Voice Annotation

One button voice recorder as on the EOS 1D.

One button manual/custom white balance

E.g. point camera to white and e.g. hit "SET", print, or some other button to set the white balance. Preferrably could be done while filming (likely causing pausing in recording similar to shooting photo while recording).

Surprisingly difficult due to the code organization. Full manual control looks easier, and now that Canon has announced a new firmware this is unnecessary.

Cropped mode

Maybe possible -- the LV VRAM is only 960x540, so it is decimated from the already downscaled 1080p video frame, but it appears that the HDMI functions can be called while recording.

Digital zoom for focusing while recording

Definite unknown.

Better sampling algorithm

it is likely that there would be a few frames lost

Swapping buttons

Done! This is in the 0.1.4 code base.

Display lens meta-data

Ability to load picture styles from media (in order to exceed current limitation of three styles).

A fix for the red dot in the 7D HDMI output.

Just move it up a bit into the masked area at the top o the screen.

As in EOS 1D, when pressing the AF-ON-button the center AF-point is selected for the time the button is pressed

Time code

Better Auto Exposure Bracketing (AEB)

Select Center AF-Point, when pressing AF-On-Button

Interval function to make timelapse

Programmable sequence imaging (for timelapses) as in CHDK

Zoom updating histogram on image review ala Leica M9

On screen RGB histogram that updates to only show the histogram of the portion of the image on screen.

Very useful for flash photography where live view histogram isn't enough. User would preview a taken image, and zoom in on an important part of the image (say a face on a portrait) RGB histogram would display only the RGB levels of this portion of the image.

Introducing a menu function to correct the level sent to the monitor/screen in Manual mode or Video Manual mode. (550D with manual nikon lenses, the Exposure Simulation misses by about three stops, making the monitoring useless.)