It is true that pseudo-hash is now deprecated in Perl 5.8 and will be removed in perl 5.10, and this is stated in perlref coming with 5.8.0. (search for pseudo-hash in perlref)

However the "use fields" pragmas is still there, and will be there for (at least) a while, but likely will point to a different implementation.

Update:

Some monks may not have 5.8 downloaded, let me just add a link to the online version of 5.8 perlref