Turns out that UIQ wasn't part of the Symbian Foundation, at least not official, until just earlier on today. With the additional endorsements by large mobile phone industry companies such as Opera, Sharp, UIQ, etc. a few hours earlier, there's a total of 40 companies now involved with the Symbian Foundation.

From the Press Release:

Since plans for the Symbian Foundation were announced, hundreds of organizations have registered their interest in joining the foundation via the website at www.symbianfoundation.org.

As previously announced, the plans for the establishment of the Symbian Foundation and royalty-free licensing of foundation software are:

1. The acquisition of Symbian Limited by Nokia, expected to close in Q4, 2008, subject to regulatory approvals and customary closing conditions.
   
   
2. Software assets are contributed to the foundation, including Symbian OS and S60 by Nokia, UIQ technology by Motorola and Sony Ericsson and MOAP(S) by NTT DOCOMO and Fujitsu.
   
   
3. This contributed software will be available under a royalty-free license to foundation members from the first day of Symbian Foundation operations, expected 1H 2009.
   
   
4. The Foundation will work to unify the platform, with the first unified foundation release expected in 2009.
   
   
5. The foundation will work to make the platform available in open source by June 2010 (two years from the Symbian Foundation announcement)

Source: Symbian