> What are the benefits of webkit2? Does it have a higher memory footprint?
> Are bugs still fixed for webkit1?

Fab already answered, but let me mention that these questions are also answered therein (plus other questions you might deem interesting regarding WebKit1 vs. WebKit2 vs. Blink):

http://events.linuxfoundation.org/sites/events/files/slides/slides_3.pdf
(it even mentions Sputnik and OWB)