For what I've read, you need to wait to microsoft release a patch to fix the bitlocker issue witch is not included in WP8.1 GDR1.
If you want cyan fast I recomend to downgrade to WP8 + Black FW. If not you might just wait but there is no ETA as the cyan for DP as been paused until the bug is fixed.
I hope the fix + cyan comes out by the and of agust