Will there be more pool party skins in the future? Summer's coming up and it would be neat to have every champion that was seen in the original splash arts have a pool party skin of their own. I for one would like to see what you guys could come up with in regards to it! :)
Also it could be useful for a new skin idea for 
:D
If Pool Party Ahri doesn't come out eventually, as in sooner rather than later, there will be a lot of angry ahri fans.
I'm pretty sure 99% of players asking for a Zac skin have called for Pool Party... They really need to work out his modeling issues so that they can skin him.
I doubt the series will be expanded, I don't think skins typically exceed more than 5 per a set. I'm not saying there won't be any beach or swimsuit skins, but I don't know about it specifically being a part of the Pool Party line.
Yeah most all skin lines haven't gone past 5 with the exception of the Battlecast set currently having 7. I personally don't want to see more Pool Party skins, as I like the ones they've already made and could come up with other fun summer type themes.
