It seems a lot of these new "free to play" tablet games are only free for a little while or up to a certain point, then become pay as you play. No thanks, I'd rather just pay for the thing once and play it as much as I want. Maybe some expansion packs for additional content, if they're reasonable. Not sure if that's the deal with this one or not, but probably.
I guess I'm in the minority, but I have no interest in the German entries in the SH series, but I love SH4. I wish they had done the "full ship model" approach for SH4 like with SH5, though I guess there was plenty in that game that people were turned off about. I think it would be cool if they did a Cold War era SH, with a hypothetical conflict where you command an early nuke boat like the Nautilus but still had the "point and shoot" types of torpedoes with TDC and sub vs sub warfare was still in its infancy. I don't think anyone's ever covered that era in a sub sim.