Sun Deal Complete, Oracle Says 'We're Hiring' (Datamation)

Because many of the people they're letting go might not be overly useful for
the work necessary on the Sun side of things? Perhaps an overseas office is
being shutdown and work transitioned to a new area, so the old employees
need to be let go and new employees in the new area hired? Maybe the new
employees will just be paid less?

It's not at all illogical to fire a ton of people and then hire in a bunch
more. It might not be the brightest idea, as hiring in a bunch of cheaper
devs pretty much always results in loss of quality, given that generally one
guy actually worth $200k is far better than 5 guys worth $40k. But there
are plenty of great reasons to let go of people and hire new ones, too,
including just having a bunch of $40k guys on salary that aren't doing much
of anything useful.

I'd imagine it's mostly relocation, though.