I wouldn't expect new macbook pro before March-April 2016. I hope these new models will bring New Macbook's improvements, like all metal enclosure, high performance speakers, butterfly keyboard, usb-c (added to other ports, not only this) and slimmer design with three color options. But maybe apple wants to separate consumer products of professional producs, they are going to release new macbook pro with macpro colour. Nobody knows...
I thing Macbook Air is going to disappear soon, when they can decrease the macbook cost.
I expect these realeases for september-october keynotes.
September: iphone 6s/iphone 6s plus and apple tv with apple tv development kit
October: 5k display for mac pro(they could upgrade internal parts of this mac with thunderbolt 3 to support 4k in 60hz mode), updated imacs, maybe updated mac minis and new ipads(I'm waiting for a true ipad mini 4, not like last year model. Not interested in Air or ipad plus/pro)
What do you think about my thoughts?
As others have replied, based on the release schedule of the mobile Skylake chips, there doesn't seem to be much rationale to think Apple will wait until March-April to release new MBPs. Also, while I do expect butterfly keyboards will eventually appear on an MBP redesign, I'm not sure why you would hope for that. It does potentially allow for a thinner enclosure, but most reviewers agree it makes for a less comfortable typing experience. I would concur that USB-C/Thunderbolt 3 would be included in a redesign.