I'm inclined to agree with rash.m2k. This is the first Maemo device to have any cellular connectivity at all so I'm not surprised that every single feature isn't implemented. They had to get the device out at some point and that meant leaving stuff out that they didn't consider a priority.

The way they are touting M6 as mass-market ready I'd be surprised if it didn't have both MMS and 3G video calls out of the box.