Cave releasing its games on PC is nice, but it'll be nicer still when it's on a platform that isn't a
rental service. GOG, please.
In terms of arcade accuracy, it'd be nice if they were close to the 360 ports. Having working ports of older stuff like Donpachi and even Uo-Poko would be cool too. My biggest fear is that it'll be partially botched by burdensome DLC like how the 360 releases were. Some of the best games were Japan-only like DDP DFK BL Arrange (Ketsuipachi), and in the case of Mushihimesama HD 1.5, came only as a pre-order DLC (that apparently was screwed up with some copies missing the codes). 1.5 and its Max modes were the real draw of that port, so it was absurd that it wasn't available more universally (at least Futari BL was easily downloadable).
I want to support Cave, but having bought all their region free releases and two PCBs, I don't want to feel like I have to dump tons of cash on the same games just to get them on another platform, unless they're really solid releases without a lot of the bullshit seen on the Xbox 360 ports. None of this preorder DLC nonsense for things like extra voices (Akai Katana, Deathsmiles) or even for game modes (1.01 Futari is fun to try and is only available as a preorder, even though it's on the game disc! 1.5 Mushi as preorder only was inexcusable). I understand that it's easier to entice players to buy a game if the initial investment looks lower and to offer the other game modes as add-ons... but it's really annoying to have to buy a copy of Futari, then buy the copy of BL, then install the 1.01 DLC, etc. If Akai Katana gets released for instance and has White and Red labels as bonuses, just make a bundle all together. The serious players would want the option of easily getting all the released game modes available anyways.
Also - please tell me you plan to actually
advertise when the games being released are known. I want to think that Cave's stuff would have sold a lot better if they'd bothered to spend even a small sum or a bit of effort advertising their releases to a wider audience, and their lack of marketing for the few western releases like Akai Katana and Deathsmiles didn't help their mainstream appeal...
My biggest hope for initial release would be Mushihimesama, specifically because of how awesome 1.5 is, and how difficult it is to find ways to play it (you need to either have the super rare PCB, or a Japanese copy with the preorder DLC, or have that DLC cd that was sold with the Cave collection). Futari would be nice too, or an official Progear port (finally - hurry up Capcom!).