I don't think they'll drop more than 4-5 good PF pieces in a year for this line.
Where it gets tough is in situations like mine where I'm collecting SW Mythos, Marvel Comiquettes (soon to be PF), and DC PFs. FML. I can't say "no" when I see a great piece.
I'm thinking next year we'll see Superman, Catwoman, WW, another JLA, and maybe one or two other Gotham baddies.
For Mythos line (off topic) I think we'll see another 5 releases.
Marvel PF (previously Comiquettes) I think we'll see MJ and three or four other drops of which I'll probably jump on two.
Next year could be a $4K year for me if this comes true. I'm starting to think about selling some of my stuff to focus my collection a little more.
However back on to Harley Quinn...
This piece is one of my more anticipated pieces. I love Harley. I think this statue completely does her justice. I think we need to see her in hand, which should be around the corner at SDCC. Unfortunately, I doubt they'll be posing her EX which is the one I think we all need to see for ourselves first hand.
Yeah, I am not bound by a single line either and that makes things a bit more tricky. Lets hope they space those heavy hitters out a bit.