What, specifically, do you want to improve for your next camera? Does the 5D3 have it? Does the 1DX have it? For that matter, does the 6D have it? Can you wait 1 year? Two years?
So far as I can tell, the likely timeline is:
2014: 7D2, cinema specific, mass market SLRs, announcement at Photokina, availability unknown
2015: high MP SLR (40++ MP, to get the boasting rights back from Nikon)
Of course, I am likely to be wrong.