Like some ppl already said, I would love to see a new msx. But not a MSX 3 but just something that already exists, complete MSX system with all the current tech with something extra maybe.
- 100% MSX turbo R compatible (r800)
- Including MSX music, Msx Audio, SCC, Moonsound, SCC+
- V9990/gfx9000 superimposed on the V9958
- 4mb ram
- Build-in flash to load roms like megaflashrom
- Some extra stuff like SD/cf card reader that can read floppy images.
- USB port for joypads/keyboard
- All MSX connector/ports
- Midi in out/through or just use a usb port for it.
- VGA or hdmi out
- Stereo out, with a switch to pan each soundchip to left/right seperately.
- Maybe ethernet
- SMALL FORMFACTOR (like mini ITX/current onechip MSX)
To answer Wolf_'s question, to get more software on the msx. the answer is imho to get a bigger/wider user base. Bigger userbase = maybe more devs from other scenes willing to start developing games. If promoted well, this all-in-one msx should actually increase the amount of MSX USERS (for example with a 50 to 100 dollar/euro price for a cool retrodevice, based on a faster z80 cpu, retrogamers may think "ah nice lets see what this is about", and retrodevs may start zerging the msx scene 
).
Although I think for such a project you would need more than 1million dollars.
A different project that I really would like to do sometimes, not directly aimed towards msx, but something I had been dreaming about for some time, is to remake the Sega Saturn Joypad with both USB and the oldskool 9 pins connector (basically aimed towards the 80's -90's computers like msx, c64, amiga, zxspectrum, sega megadrive etc etc). The Saturns Joypad is generally regarded as the best digital joypad ever made. Right now afaik they no longer in production, and anything on ebay saying its a new sega saturn pad, is basically a lower quality (licenced) pad produced in china that starts to break down after 6 months. Yes I know 10 buttons is a bit overkill for msx but whatever 
http://www.old-computers.com/museum/photos/sega_saturn_pad_1.jpg
SMALL FORMFACTOR (like mini ITX/current onechip MSX)
If a new MSX were to be produced, I would like it to look like a "old school" MSX, which is something that 1chip MSX lacks. If I have to use a PC keyboard together with a small box merely big enough to fit the cartridge slots, I don't feel like I'm using a real MSX but rather a "hardware emulated" MSX. Yes, it's quite silly and I understand that 1chip MSX-like projects are our only chance to have new MSXes in the future, but this is how I feel. 
SMALL FORMFACTOR (like mini ITX/current onechip MSX)
If a new MSX were to be produced, I would like it to look like a "old school" MSX, which is something that 1chip MSX lacks. If I have to use a PC keyboard together with a small box merely big enough to fit the cartridge slots, I don't feel like I'm using a real MSX but rather a "hardware emulated" MSX. Yes, it's quite silly and I understand that 1chip MSX-like projects are our only chance to have new MSXes in the future, but this is how I feel.
Yeah when I think about it a bit more, I actually i wouldnt mind at all if a new msx will be produced if it would be bigger then what I suggested.
BUT imho not as bulky as the old msx (mind you I had a sanyo wave fd2 which was one of the the biggest msx ever )
Maybe something the size of a normal PC keyboard, not as thin but still thinner then existing msx'es, with space for the ports at the back + 1 at the "top" above your F-keys.
The GM.MPC config will sound terrible on your mt32 as the mt32 is not gm compatible and has different channel settings.
The MT32 is not the best solution but it seem's that it isn't that bad.
I prefer using Yamaha XG modules as they do have a nice warm sound, but the Roland sound canvas series are doing a good job too (SC88 better then the sc-50)
The SC-155 and the SC-88 do also have a audio in, that's nice as you can mix in your msx psg !
Thanks a lot for the info! Those models are probably a bit harder to obtain..but, hey, let's start with the MT-32 and go from there..
I think i want a MSX with a commodore64 emulator inside .. Just for fun to win the fight finaly from the 80'
activated like : CALL COMMODORE 
I'd love a real size Dalek connected to MSX slot. 
