Ehhh....at this point of Liam's career I don't really think I'd want another album, maybe just a short tour because we know he tends to sound near the end of long tours (2002, 2006). What Noel is writing right now for his solo albums are pretty generic and aren't that catchy so in my opinion the songwriting would have to be back to Liam, Andy, and Gem, though I wouldn't want an Oasis reunion without the 5 original members, including Tony.
I wouldn't mind Liam, Andy and Gem handling more of the songwriting, especially if it was in the vein of their stuff on previous Oasis albums and the first Beady Eye album but not if its similar quality to the awful stuff on their second album together as BE, I thought that album was atrocious and I think they may have also realised this as they split soon afterwards. I feel the same about Noel's albums too really, enjoyed the first one a lot, the second one not so much...
There's no denying Liam doesn't sound anywhere near as good as he used to but I actually enjoyed the last Oasis album 'Dig Out Your Soul', I think 'The Turning' in particular was classic Oasis... If they could put out an album as good as that or better I'd be happy because lets face it, none of us are expecting another DM or MG from them at this stage.
I can't see them reuniting with Tony either, they've been pretty harsh about him in regards to his 'drumming abilities'! I think when they buried him at the end of the 'Live Forever' video that said it all haha!
At the very least I would like to see this band live one more time before they all retire.