I'm assuming they'll have a bundle deal if you buy both like they did with 10.3 and iLife '04. It was a small discount, but only a little more expensive than just buying 10.3. 10.3 did come with the previous, free version of iLife. '04 was a paid version, and not included. The latest version of iTunes will be included with Tiger of course, and I'm assuming a version of iPhoto. Maybe '04, but it could be the previous version. iDVD and GarageBand, probably not. But considering Tiger isn't out yet, we don't know. Even if the Dev release does, that doesn't mean anything.
Like I said, they'll probably have a bundled price if you buy both, but '05 will not be included.