Those two combined with something like the SAM-BA bootloader (Arduino SAMD bootloader compatible with BOSSA) would allow us to make easy-upgradeable one-chip border-router USB dongles based on the ATSAMR21. USB CDC ECM essentially could remove the need for ethos.
#11077 and #11085 could be in the incoming release but it will require to have #11075 and #10916 merged first.
Hopefully, #11075 should be pretty straightforward and #10916 (which introduces the stack) is in the final review state.
Any help with the review and/or test process will be highly appreciated !
I would personally like to manage to get the migration to FLASHFILE finally finished https://github.com/RIOT-OS/RIOT/pull/8838 (I only have the tracking PR currently, so it's my fault if it did not move) and the fix for flashers on the board I use for testing the release https://github.com/RIOT-OS/RIOT/pull/10870 as I currently use them for testing anyway. I could need help for that last one if you have examples that put any of the mentioned boards in a no more flashable state with RIOT.
would also be nice to add IPv6 fragmentation  and reassembly . I think the feature will be finished today for the most part (only tests for fragmentation are missing). However, 6LoWPAN NHC adaption for extension headers (on which IPv6 fragmentation is based on) is still missing. This isn’t a blocker, 6Lo packets won’t just not be compressed starting with the extension headers, though.