It's hardly surprising to see Acer subsidiary Gateway outing its own take on the Aspire Revo theme. However, those hell bent on squeezing every inch of performance from a netbook might find Gateway's offering that bit more interesting than Acer's.
The difference between the Revo and the Q2800? The latter has a dual-core 1.6GHz Atom N330, an improvement of sorts on the single-core offering in the Revo. Just remember that doubling the core count of an Atom CPU does not double its performance by any stretch of the imagination. The QX2800 also comes with a 500GB hard drive, offering a decent amount more storage than the Revo's 160GB drive.
Otherwise the same Ion chipset, 2GB of RAM and Draft-N wireless remain within the identical chassis. Externally, therefore, the only noticeable change is the colour scheme and logo. For what it's worth, I think the QX2800's white and black looks much nicer then the Revo's blue and white.
No pricing yet, but given the higher specs, it's likely the QX2800 will be a fair bit more expensive than its cousin. A UK launch using the Packard Bell branding is only to be expected - slotting in at the top of the iMax-Mini nettop range, presumably.