Without merging, I don't see Kaleidoscope as a legitimate competitor to Changesapp, except in image comparison. Still, I'm glad to see the competition.
(This is one place where Mac devs could also benefit from looking at Beyond Compare or ExamDiff Pro on the Windows side; they're great tools themselves.)
I know you won't answer this, but do you think it will come to Kaleidoscope faster than it's come to Versions? (how long has Versions been out? 2 years?) Or, when it comes to Kaleidoscope, will you use that functionality in Versions?
I started typing a really long reply yesterday, but you're right, there's not a lot we can share in public about our plans right now.
One thing I do want to share is that SVN merging and text merging are completely different problems. Both would be great features for either app, but there's not a lot they could share implementation-wise.
SVN merging means dealing with the pre-defined features and limitations of SVN (both a pro – it already works – and a con – it is really hard to make something within the contraints of SVN that's not too error-prone and easy enough to use).
For text merging, we'd get to work on a completely 'new' problem, the only systems we have to code against are the file system and the cocoa text system.. More work maybe, but 'easier' to create something excellent.
Not to beat a dead horse, but they've been promising that feature for Versions at least since July 2008 (that's as far back as I could trace in their Google Groups mailing list). If you're happy with Kaleidoscope's current feature set and will continue to be happy if they never deliver on this promise of future updates, go ahead and buy a license (it does look pretty nice as-is). Just don't hold your breath waiting for that merge feature.
They use these images for that effect in CSS:
http://www.kaleidoscopeapp.com/static/img/ks_color.png , http://www.kaleidoscopeapp.com/static/img/ks_shading.png , http://www.kaleidoscopeapp.com/static/img/ks_mask.png
Lack of merge support is a deal-breaker for me. I was so hopeful because that's the #1 most requested feature in their other app, Versions.