No. iLife 08 and iWork 08 are currently 32-bit software applications. They are sold seperately from 10.5 Leopard, and don't come bundled with the operating system.
The iLife 08 that ships with Macs pre-installed with 10.5 Leopard will also be 32-bit.
I highly doubt we will see a 64-bit version of either iLife or iWork anytime soon. As not even Leopard's bundled applications (Finder, Photo Booth, Front Row, etc) are 64-bit applications.
Why would you even want to have a 64bit version of iWork anyway? iLife I can imagine possibly being made 64bit at some point but iWork just seems pointless.
In our enterprise deployment, one of our departments handle a 150K line excel spreadsheet. If iWork's Numbers were 64bit, it would be able to handle that without sweating.