AMD's stuff will be next. High end Titan X was announced today, but that's an outlier. 380X and 390X have been discussed, but no release dates. Some leaks say the vague Q2 of this year, but that's just rumor. AIO coolers may be used on 380X, so it will likely be a high power card compared to the competition.
Nvidia will likely trickle out Maxwell revisions such as 980TI, 980TI Black, Titan, Titan X, Titan X Black, etc etc. I'd speculate that it will look a lot like last generation.