Has the study design improved in your opinion?
Yes and no. My honest opinion is that methods 1/2 should go on to specialist 3/4 - until they do that, there is no improvement.

The inclusion of the new statistics stuff is nice, and they've added in separable DEs (which was literally in the last study design, just not specifically mentioned or taught...) Still no integration by parts, though. :\ Further is the most interesting - I don't whether if it's a step in the positive or negative direction, but it's definitely a step...
Aaaaand they still haven't put up the assessment reports from last year. Classic VCAA. :p
Legit so much annoyance. >.<
So then...looks like it's going to be harder to tutor spesh without actually looking at this extra probability and statistics....
Arc lengths of curves? What, by integrating sqrt(1 + (y')^2) dx? That'll be interesting. Dunno why they removed ellipses and hyperbolas though; those weren't exactly time-consuming to learn.
There's statistics as well as probability now; I don't know if spesh is going to be more fun or not to teach next year.
The statistics inference in methods is stupid and I hate it. >( The stuff included in specialist is great, though - confidence intervals and hypothesis testing is great fun, and I love it! They definitely could've added more (such as estimation), but what they've done given the limited amount of probability knowledge is pretty cool.
Granted, there is no way to prove the formulas used without central limit theorem, and to prove THAT you need the use of the characteristic, moment generating or probability generating function. So, there's that, which is annoying. :\
As for conics, they're still there - they've included them in parameterization, they've just removed them specifically. Basically means there won't be any more conics questions unless "vector calculus" is involved.
Does anyone have a list of all the changes?
Apart from the new statistics stuff, I've noticed from Methods that modulus functions and linear approximation have been removed. However they have taken out the "(formal derivation is not required)" clause from the derivatives section; maybe we'll see more proof questions?
For Spesh, they've taken out ellipses and hyperbolas and added in arc lengths of curves, separable ODEs and the probability bit. Is there anything else?
Modulus is now in specialist, too - so, there is that.

Otherwise, I don't think there's anything else - they could've included a lot of things, but I think they're a bit hesitant given the massive changes to Further.