I think the specification for HDMI 1.3 may be able to support bandwidths higher than 1080p, purely from a technical headroom standpoint. However, there are no new resoultions in the works that I am aware of higher than 1080p.
Similarly, DTS Master Audio and Dolby TrueHD can technically carry 14 discreet audio channels, but I don't think anyone is even thinking about anything higher than 7.1 for consumer use at this time.