Please note that this is an early version of the Resource Manager. We will be adding features and fixing bugs with it over time. Most notably, it does not support any sort of payment system, so paid resources cannot be released through it (see below). It will eventually be released as an official XenForo add-on. Pricing and release date will be announced at a future date.
Seeing as it isn't out now and we're in the last month of Q2, it's just an assumption that when XF 1.2 is released, along with it would be the release the RM. Not to say that is what will happen but it seems like a logical guess if feature development for XF 1.2 is complete so they can focus on bug-fixing/adjustments only for the RM and XF 1.2.
It is running here and will be released at some point.
I can't think of a need for the RM so I haven't been following it, but I am certain it will be released here at some point.
It's your option to wait or come back later.