Just found about this awhile ago and I'd like to congratulate Colin and say huzzah for a new 2300AD RPG (yes, I know it's a bit premature, but here's hoping it all works out). Too bad to hear about 2320AD, but after many years of no news and no print version in sight, it wasn't unexpected. Got the pdf way back when it was released and it's really sad that that material has to be wasted (sort of, as it cannot be used on the new 2300AD). Oh well, once more unto the breach, Colin!
If were up to me, I'd update the starmap and "modernize" the setting from it's 80's origins. By modernizing, I don't mean making it into something unrecognizable from the original (no transhuman space this!), but e.g. taking into consideration the technological progress of the past 20 years and changes in the political world and such. Of course anything written today will be just as outdated in the next 20 years, as the original 2300AD is now, but so what, we're playing the game now (well, soon). I don't need to worry about how it'll hold water in 10 or 20 years, we can revise it again then :wink:.
What I would leave out, first and foremost, would be the "god aliens" and psionic powers. This is supposed to be hard SF after all. I'd also drop few of the intelligent alien species too (not Kafers, nor Pentapods). It's a bit too crowded in the 50 ly sphere around Sol, IMO. Also, in name of hard SF, I'd drop the plasma guns (do we really believe they'd be doable - at least the man portable ones need to go) and wide use of hovercrafts (I know they're a trademark of the game and I really like them too, but for a hard SF game, I think they're a bit, ehm, iffy -- I think we'd have seen wide use of hovercraft by now if it were viable). Just my 2 cents. YMMV.
I've got no objection to making the twilight stem from e.g. a meteor impact, but a world war suits as well, so long as the reasons for it are left a bit vague (I hate very specific near future history in SF games - hmm, isn't "future history" an oxymoron...). Anyway, enough of my mindless rambling, just want to say that I think this is a great opportunity to revise and revitalize the 2300AD universe and make it more, eh, modern. Sorry to keep using that word, but can't seem to find another suitable one (English is not my first language, you see).
I am glad Colin is the person at the helm of this revision. Godspeed!