I wonder if the reason they've 'upped' the spec on their MacBooks is to clear stock.
I'm also pretty sure that the refurb MacBooks have dropped in price recently - I think this may also be a possible sign - getting rid of what's not needed.
Leopard is not due out till October - by then I think LED back lit screens will be regularly filtering through to Wintel Laptops (even getting into the budget models in some cases) I think this will be true of MacBooks (not just the pro) also.
More powerful CPUs and better on board graphics have become (and will become) available since the release of the current models - so I think there's a few things they can do - and I think they will do. October will see new tech and OS in the portable and iMac range - I think