looks like they've decided to refund some folks $100 (they had had, for a short time window, a $379 upgrade price on the N1 for existing customers for one plan, $279 for another plan - then dropped both those and now have brought back the $279 price for existing customer upgrades
Nexus One Upgrade Price Change Cometh | TmoNews - Unofficial T-Mobile Blog - News, Videos, Articles and more
" Good news, earthlings! Apparently Google's taken all the complaints about Nexus One upgrade pricing to heart, because it's giving $100 rebates to current T-Mobile subscribers who paid $379 for the HTC-built handset -- and it says it'll be widening the net and offering upgrades to even more current T-Mo subs, although we still don't know how that's determined. That means the new Nexus One pricing tiers break down like this: $529 unlocked, $279 upgrade for (some) current T-Mo subs, and $179 on a new 2-year contract. Handshakes all around. Now, let's fix up family plan activations and that crazy double ETF, shall we?"
Nexus One Upgrade Price Change Cometh | TmoNews - Unofficial T-Mobile Blog - News, Videos, Articles and more
" Good news, earthlings! Apparently Google's taken all the complaints about Nexus One upgrade pricing to heart, because it's giving $100 rebates to current T-Mobile subscribers who paid $379 for the HTC-built handset -- and it says it'll be widening the net and offering upgrades to even more current T-Mo subs, although we still don't know how that's determined. That means the new Nexus One pricing tiers break down like this: $529 unlocked, $279 upgrade for (some) current T-Mo subs, and $179 on a new 2-year contract. Handshakes all around. Now, let's fix up family plan activations and that crazy double ETF, shall we?"