I've been watching wait times religiously in anticipation for our end of February trip. Flight of Passage is guaranteed to open the day at 120 minutes. Whether that is accurate is another story. It's been reported that they let folks in to FOP before official opening time, so it wouldn't surprise me that it is accurate.
On top of this you still have Frozen Ever after that commands a big line, and 7 dwarfs mine train as well.
The only solace that I can take is that when star wars opens, Toy Story land will already be up and running. You will in effect have two new E-tickets to spread the crowd. The reason this is important is in theory the capacity of the park is not increased. So only having one would make that one miserable, having 2 should split it up more evenly. It also seems as though capacity may be greater with the DHS additions.
I think they've really underestimated the popularity of Flight of Passage. That surprises me some in that Soarin' was popular enough to warrant the addition of a 3rd theater to improve capacity, yet your new attraction that is like Soarin' on steroids, debuts with a lower capacity(22550/day soarin vs 17280 for FOP). I'm hoping they learned a little bit from this and up the capacity in the new dhs stuff.