Development in 4.6 beta waiting for 4.6f release

I'm at a crossroads in keep on working with NGUI or switching towards uGUI now, reengineering the work done until now and developing the missing UI with uGUI. Provided that I won't go in production until the end of the year (and by that time having the 4.6 final or more available) I'm wondering what level of confidence there could be in migrating my project from 4.5 to 4.6 beta, developing with the beta and then apply version 4.6f when released.
Someone sees the risk of issues that could lead...

Development in 4.6 beta waiting for 4.6f release