Some 3rd party bottlers do buy new malt from a few distilleries and mature it in their own casks, most distilleries won't sell either new spirit or mature whisky to 3rd party bottlers. The majority of these casks for bottling are bought as mature whisky from blending companies who do have contracts with the distilleries for new malt whisky. This normally means that it's filled into blending casks and is surplus to their blending needs, they fill on a 6 to 12 year ****s forecast so there's always the chance of their filling too much.
It's really up to you whether you think the bottlings are collectable, personally I don't collect but rather drink them, and also whether the quality is as good as you'd like. Like any whisky you can't tell the quality until you've tried it - have a look at the thread on samples