To get an idea on which mods we're waiting for, I've made a nifty Google doc detailing which mods have released a 1.6 version. You can read it here.
We're probably not going to wait for all the mods to update. Currently we're waiting for Binnies mod, Forestry(and related mods), Minefactory Reloaded, Logistics Pipe, Railcraft, Rotary Craft, Redstone in Motion and Thermal Expansion.
I'll try to update the list as I do updates on the mod pack, so the information may be slightly out of date. If you know of a mod that's updated already, just let me know
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