My thinking is to wait until the summer/June to see if they release a new MacBook Pro 13", or does anyone know when they'll release this?
The 13" rMBP was updated to Broadwell and the new trackpad in March, so its probably the least likely summer release, with the most likely being a matching Broadwell + force touch update to the 15" just as soon as the mobile quad-core Broadwell chips are out.
The next major revision to the rMBP line will probably be dependent on the next generation "Skylake" chips and Thunderbolt 3 - which uses a new, smaller connector and could allow for slimmer MacBook Pros.
Given its only a few weeks until the big developer conference on June 8, it would be prudent to wait unless your need is urgent. However, there's absolutely no guarantee that any new Macs will be launched then.
It's not impossible that they'll announce all-new, redesigned Skylake rMBPs then (and skip a Broadwell 15") - Apple have had 'scoops' on new chips from Intel in the past - but I wouldn't hold your breath. A minor Broadwell+force-touch update to the 15" probably wouldn't warrant a launch at the conference, and could be released with minimal fanfare at anytime.
If you're definitely after the 13" its probably a reasonably safe buy now - but everything has been messed up by the Broadwell delays so there's no certainty.
Also, would anyone recommend the new MacBook over the pro?
Not if you actually need the power and connectivity of the Pro.
I think the target MacBook customer is someone who has a more powerful computer on their desktop and finds they can't
quite get by with an iPad on the road.
Its also going to be a slight pain until a wider range of USB-C devices and adapters appear (as they probably will).
