Straight from Neowin.net here are the Windows 7 Anytime Upgrade and Family Pack pricing details.

Windows Anytime Upgrade
WAU allows users who purchase machines with Home Premium or Starter to move up to a higher edition of Windows 7. After Windows 7 is released to market on October 22nd, you will be able to buy a retail package that contains an upgrade key from retail outlets. The pricing structure will be (US, EU, GBP):

• Windows 7 Starter to Windows 7 Home Premium: $79.99 · €74.99 · £69.99
• Windows 7 Starter to Windows 7 Professional: $114.99 · €184.99 · £119.99
• Windows 7 Starter to Windows 7 Ultimate: $164.99 · €204.99 · £139.99
• Windows 7 Home Premium to Windows 7 Professional: $89.99 · €179.99 · £119.99
• Windows 7 Home Premium to Windows 7 Ultimate: $139.99 · €189.99 · £124.99
• Windows 7 Professional to Windows 7 Ultimate: $129.99 · €134.99 · £84.99

Windows 7 Family Pack
Microsoft also announced that the Windows 7 Family Pack will be available on October 22 and priced at $149.99 in the US and $199.99 in Canada for 3 Windows 7 Home Premium licenses. Consumers will save $200 in the US by purchasing the Family Pack over individual copies. Microsoft did not supply pricing for markets other than the US and Canada.