Correction: Greenwich trains stopped stopping at London Bridge station on 26th August 2016, not in 2013 as I said in the previous post. (Moral: for intel of this kind, best to trust your neighbours and the News Shopper more than City A.M.)
There are the same number of platforms at London Bridge station now as before - 15, all rebuilt, but now six of them are terminal platforms, and nine are for through trains, whereas before the upgrade there were nine terminal and six through platforms.
(Sources: Network Rail, Southeastern, and Wikipedia.)
Greenwich trains go from platforms 1 and 2 (maybe others too - not sure). (Source: experience, word of mouth.)
Southeastern trains to/from Cannon Street/Greenwich:
2 trains per hour (tph) Dartford via Greenwich and Woolwich Arsenal
2 tph Loop service via Greenwich and Woolwich Arsenal to Slade Green then return via Barnehurst and Bexleyheath
2 tph Loop service via Bexleyheath to Barnehurst, then return via Woolwich Arsenal and Greenwich