I don't have a strong opinion on the subscription concept, though the devil is in the details:
We're being told that Producer owners can get the $20/month rate when everybody else has to pay $50/month... I can't see that lasting forever. I'm never going to commit to spending $600 a year on one piece of software so I'd probably want to continue doing what I do, which is pay the full price to upgrade every 2 or 3 years. But I don't see any information on what sort of upgrade pricing will exist once this has been underway for a while. If I upgrade to 'Sonar 2015' (ie. the next version that comes out), I'm not willing to pay the full $499 up-front for Sonar 2017 or 2018. So this is an increase in uncertainty. (Sure, we never knew for sure that future updates weren't going to have massive price hikes, but that was unlikely when the business model stayed constant. Now, it's different.) Ignore this - I'd missed the part where they specify that upgrade pricing and subscription resumption pricing are the same - so it would be $20/month or $200 for a year, either way.- This is producing a culture of paying for 'updates' where updates include bug fixes - but bug fixes should be part of the initial payment, because when you pay for a product, it should be working in the state that is advertised, and if something is clearly broken, I am entitled to a fix for it even if the fix takes 13 months to develop rather than the 12 months included in the subscription. Sonar has been frustrating in recent years because I end up having to pay to get upgrades to increase stability, while seeing much of the work appear to go on new features I have little use for (screensets, analog-style plugins, ProChannel) and leaving other features that I would like to use in a half-broken state (step sequencer, matrix view, take lanes sort-of-but-not-really replacing layers). Please, I know it's not sexy and you can't put it on your sales page to drive new custom, but please dedicate some more time to fixing these old problems with features we've already paid for - then we'll feel better about paying for more things in future.
Regarding the new features themselves, it looks like a reasonable selection. The majority I don't care about (new Control Bar, Audiosnap enhancements, Pattern tool, PRV enhancements (unless it fixes the note name column problem - I certainly don't want the massive chunky notes shown in the new video), Direct Stream Digital), some I don't need as they duplicate stuff I already have (REMatrix Solo, new FX chains, Addictive Drums 2, custom amps), some I will try out and might use sporadically (VocalSync), a couple could be really useful (mix recall, MIDI clip stretch), and a couple are laughable ('FX Stacking' and 'Expandable sends' are not really features but just reflect someone finally working out how to handle dynamically sized UI elements with the Skylight UI system - something that should have been in from day one). Is this enough to justify the upgrade? Not really - unless I see some evidence that there are fixes to old problems, or maybe if some of my other feature requests get a look in (split-with-crossfade, FX bins and faders on track folders, etc).