I think it's interesting that Ferrari and McLaren - using the same wind tunnel - are pursuing quite similar avenues.
They've both undercut their sidepods, done a lot of work cleaning up the back of the car, incorporated "Red Bull style" rear suspension packaging, both running pull-rod at the front too, and both, for now, sticking with the exhaust concept from last year.
It may be that both test some other alternatives in the exhaust, but also that they think the cleaner airflow they've got with their current solutions outweighs the small gains in exhaust flow from cluttering up the area with ramps.
But I also like what Ferrari have done with the gearbox and rear wing, both of which could be significant. Sam Michael's original explanation about why Williams went down their gearbox path was very ineresting, and coupled with the other facets of the Ferrari, is a good direction for them, I think.