Universal Audio has responded to concerns about delays for UAD2 owners getting UADx licences.
In a post on their website they write;
Delays in Native (UADx) Licenses for Owners of UAD-2 Plug-Ins
If you already own a UAD-2 plug-in or UAD Instrument that has been ported to UADx, then you can get the UADx native version for free.
Please note that due to the high volume of UADx plug-ins that are being issued to UAD customers, it may take up to four days for the licenses to be fully deposited to your account. We expect that this process will be completed by April 4th.
Once the licenses are deposited, follow these instructions to use your UADx plug-ins:
Download and install the latest UAD Software including UA Connect
Open UA Connect and login to your uaudio.com account
Allow UA Connect to create a new iLok account or link your existing iLok account
Redeem your UADx plug-ins in UA Connect
Download and install your UADx plug-ins
For detailed instructions please see this article.