Jundroo has came out with the biggest and the most awesome update ever. So, let's get right into all the features.

Parts:
Hinge Rotators, pistons, and small rotators: They're a great addition, we don't have to use so complicated mechanisms.
Shock: Now we can make cars, and landing legs on rockets!
Beacon light: They're very pretty, only wish they actually light things up.
Resizable wheels: Oh so awesome, and useful.
BFE-300: Now, we don't have to make multi-Part engines!

Features:
More .xml editing options: Yay, Rainbow exhaust!
Circular fuselage option: Hmm.. the devs outsmarted me again!
Trim: Very useful.
New races: I'm not a race guy, but I think they're a fun addition to the game.
Locations dialog: Awesome.
Interactive Tutorial: Yay, no more scrubs making use less things.

Islands:
Snowstone: Not as big as I expected, but fun to fly around.
Maywar: I don't feel as if it has a use, other than lagging the hell out of my weak laptop. Maybe remove the windmill farm, doesn't fit with the Egyptian theme.
Sky Park City: Great and fun to drive and fly around.
Random scattered islands: not so much use, than looking cool.
Kraken: Great to bomb and 1v1.. Oh, and Kraken isn't on mobile, deal with it.

Bugs:
Fixed bugs: Yay!
New bugs: Hnnnnnnnnnrrg