3.2 (April): HM nerfs
3.3 (July): NiM Rav/ToS
3.4 (September): New Ops
It's a pretty optimistic prediction, one that assumes quite a bit, but still foreseeable when comparing this tier to past ones. I will say this, though: if we don't get NiM by 3.3 in July, we won't get it at all. I'm of the opinion that NiM is certainly coming, but I realize that this tier is unique in how difficult it will be to implement. But the difficulty lies with BioWare's hesitation to address the staggering issues of current HM content and not in it's inherent design. NiM was presumably planned long before 3.0 released and I doubt they would scrap it because they made some tuning mistakes. Not saying NiM is guaranteed by any means, just saying that it's more likely to be on the way than not.
This, of course, would mean new Ops won't make it until 3.4 in September at the soonest. So new content drought is 9.5 months compared to previous 14 months; better but still much too long considering no communication from devs on the matter.