There is a plan to do a reworked cover image - But exactly when that will happen is uncertain!Mhm i wish they would have used some different picture for the "cover". The standing pictures are rather basic and does not represent quality of the scenes. Kagura also won't be using any NSFW screens for advertising the game. There are some pieces of scenes that are SFW that they could use but will they notice? Maybe you guys should have prepared some custom art for them to use as cover. Just saying.
Yes it will be on steam although it is probably inaccurate to say that _they_ will launch it. The devs have given rights to publish the game to Kagura and i believe they can't sell the game on their own anymore (with patreon being exception).
Actually i wonder if they still will be able to post full game on patreon past steam release or there will be only patches. Also they don't control when it will be released nor Kagura is to obligated to certain release window (or if they are those terms can't be disclosed).