Negligible but there. And if anything you're reinforcing my point, because rather than reducing the Pro by ~$50 or more... and taking a $50 hit on the spread between a 60GB and 120GB drive... they're reducing the Elite, kicking out the Pro, and instead for them the calculus becomes the costs of a drive vs no drive within that $100 spread. See what a material effect that has?
So to restate, yes - 60GB vs 120GB drive, marginal difference. 120GB drive vs no drive, substantial difference. They're not getting rid of the 'Pro' in my opinion, they're getting rid of the 'Elite' in the truest sense, re-naming the Pro, and making some minor and cosmetic changes to it. The $400 price point has been abandoned, but it's a line at $300 they wanted to hold, rather than let their more expensive SKUs cost-wise (and here I don't differentiate between Pro and Elite) slide below $300.
As for the cables... cables are cheap, but MS' included component cables were more expensive than most I would imagine due to their heft and proprietary interface. Now, not only have they gotten rid of that expense for themselves, they will make money off anyone who needs to purchase one, whether 1st party (nice profits there for sure), or even 3rd party due to licensing. There is essentially no 'generic' option for component cable since the interface is not an open standard.