Check the used key. After upgrading my system to the Pro Preview the system used the Win 8.1 Retail Install Key, so i needed to enter the TP key manually .
The first, KB 2987107, is the IE 11 rollup patch for Windows 8/8.1, MS 14-056. technet.microsoft.com/ library/security/ms14-056. I don't see anything that's TP-specific about the patch. The second, KB 3001237, doesn't have the KB article posted as yet, but it's supposed to be a Flash Player security patch for IE 11 on TP. Ho hum.
A new TP patch just hit - KB 3000061 is the Windows 8.1 Kernel driver patch, MS14-058. technet.microsoft.com/ library/security/ms14-058 Considering how much fun we've had with kernel drivers lately, it'd be a good idea to avoid it for as long as you can. (Thank you, TP-forced Automatic Update.)
That could be true, but it's never stated in the Microsoft information database. It's a security patch for Internet Explorer though.