I don't think we will see digital only consoles this gen. And as for slims, simple...
PS4 Slim: Console sold exactly as is but slimmer and with 500GB $199/$249(max)
This console should be coming in 2017. Reasoning for this is that I expect the PS4 to be dropped to $300 in 2015 and by 2016 we will have the PS4 as it is today but with 1TB HDD sold at $300. So by 2017 the slim version wil come out with a smaller HDD (simply going back to 500GB) and a lower price point to do for sales what a $300 1TB PS4 can no longer do.
XB1 Slim: Basically almost the exact same thing but this one is a little tricker. 500GB@$199/$249(max)
The tricky bit about this SKU is the timing. If XB is losing heavily to PS by the end of 2015, this will definiately force their hand in 2016. First off I expect MS to be the first to go below $399, and be the reason both consoles will be at $299 at the 2015 holiday season. If that doesn't slow down the PS4, then MS will have to drop price again in 2016 and the only way I see that being possible is with a complete hardware revision. So i expect the XB1 slim to come before the PS4 Slim this time around in 2016. I basically expect it to shrink to the size of the PS4.







