I would like it to stick as close to Classic Traveller as possible, but integrate the extra stuff from the supplements into the basic character gen (like MegaTraveller did, with the new skills from advanced character gen like Gravitics available on the standard skill tables).
I would like it to not have the standard Mongoose rules 'innovations' that are ridiculous in play: nerfed combat damage, skills that actually get numerically worse as you 'improve' them, the fear rating fiasco from Starship Troopers, the Space Combat from B5 1st ed., the torpedo fiasco from Victory at Sea, etc., etc. ... Mongoose seems determined not to release a product that isn't somehow disastrously flawed, despite all its promise. I would like for them to avoid this self-sabotage so I don't get burned yet again for buying one of their products.
It would be nice if they could stick to the relatively clean style of presentation from Classic Traveller. I don't need glossy pages and comic book-style illustrations of rejects from Miami Ink like your typical 3E manual.
Finally, I hope they retain the character gen system's charm, especially in its tendency (as opposed to most recent games) to produce older characters. In a civilized, 'modern' society, those individuals most likely to be both financially independent yet also competent enough to adventure as free agents will tend to be slightly older individuals compared to the typical 13-year old ninja swordmaster archmage Ph.D. former Supreme Court Justice that you find in anime and in those things under its influence. These days, a game that encourages you to play someone who already has an education, military service and career under his belt is a refreshing prospect. And for the same reason, I hope they keep the skill advancement system very low-key and restrained.