1.14 release concerns.....

So, yeah, not really a bug, just some concerns I have for 1.14. Firstly, will there be a way to re-generate oceans, (meaning everything touching water in an ocean/deep ocean biome below Y=64), so as to allow older saves, (i.e. my current 1.8 era world of which I am very proud of), to experience the new oceans? Second, when those new graphics come out, as there will be a way to use the old ones, will that also include the ability to use the old horse model too as part of that Classic Graphics? Lastly, are there any plans for the continuing functionality of current TNT Cannons when the new water behavior is introduced? Thanks for taking the time to answer my questions, and I can only hope that this will help with the development of the new features of 1.14. Rockatoa, Brickticks out!