In an email on 27.05, Jonathan gives us a preview of what will (probably) change between 3.2 (released on 24.05) and 3.3:

  1. omnithreads will be replaced by boost threads
  2. the single-thread scheduler will be removed (only the thread-per-block scheduler will remain)
  3. the inband code code for the usrp1 will be replaced
  4. existing blks2 blocks will be rewritten from python to c++
  5. the libusrp header files will be moved to include/usrp
  6. gr-comedi will be deprecated

Stay tuned!