Hardly a big surprise. Last year when TC dropped its PoCo DSP line, which also included the Sonnox plug-ins, they offered a cross-grade to the UAD-2. UAD's tie-up with Sonnox was announced long ago. Anyway, BFD, Sonnox already offer native versions and nobody needs to use UADs to run 'em.
Now, a surprise would be if UAD started offering native versions of its own plug-ins...