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Well you should be happy for the Ploy and Ice story cause they may include Donut and Pmew if you read the manga Lily Love and you liked/loved it. And yeah you should be sad that Pulse will be ending, since we're all concern of Lynn's health and may end with a happy ending or a cliffhanger. To answer your question, Pulse ending, don't worry there's more stories being planned by Ratana Satis. Upcoming stories.
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I'm hoping for a happy ending in Pulse, but it could go the other way as well. So far I've seen only one yuri that did not have a happy ending (it was a very sad ending) and that was Philosophia. I don't think I can stand another one like that.
But yeah, Ploy and Ice is a couple that would guarantee some fireworks.
There's gonna be more of this, however the couple will be different- Ice and Ploy :3 After Pulse is finished ratana satis will be making a story about Ice and Ploy !!!
Further information is here:
http://three-musqueerteers.tumblr.com/page/3