The thing about the falcon is, it was such a sweet all plastic kit (with the visible crew and all weapon options) it doesn't really need to be changed. To this day it remains one of GWs best looking vehicles and they really hit the ball out of the park when they made it. And I say that and I'm not even an Eldar player!
As to the Basilisk, I reckon it will get the Russ/Chimera style makeover (or at least I hope it will), in that it will essentially look the same, but there will be little changes here and there. And hopefully it'll contain all the parts to make all the ordinance battery options. Which shouldn't be out of the question. An earthshaker and a medusa are quite similar in appearance and could share parts. For an example of what I mean, look at the battle and vanquisher cannons on the Russ kit.
And yes, please please give Ogyrns a boast. They're one of my favorite units in the fluff but they just don't work atm. Points reduction please. Even if they have to moved from bulky to very bulky. Also, if they came with the option to take other weapons besides ripper guns. Like, Punisher Gatling Guns. Because big gatling gun wielding brutes are always cool.