It's worth waiting definitely if you wait for now.
Yes it will support i7-5930K, all Haswell-EX, Broadwell-EX and Intel Xeons from two generations.
Rampage V 10th EDITION is much nicer than X99 Deluxe, If you have working X99 board than better wait July.
You will have Rampage V Extreme Black Edition I mean 10th Edition.