Yes, I've watched the Pen-blwydd special, and the two new episodes. I enjoyed the special, because it gave me a peek into the history of the shown (I've only been able to watch since just after Christmas 2015, so I don't know much). But I do agree it ruined the cliff-hanger with the sneak-previews of the new season!
Also, I was a bit confused right at the beginning of the first new episode, because it felt like I had missed something...wait, Alwena is standing in the shop, she's not still in the hospital! I thought it would take up right where it left off, but apparently the new season starts after some time has passed. Which is fine, just not what I was expecting!
So happy Alwena is still with us! And happy that Rownd a Rownd is back! I enjoy watching other programs available to me on S4C International, but this one is the most fun I really wish we'd get Pobol Y Cwm because I do find the Southern people on RaR easier to understand!