confusion with pkg_chk -N

[Tyler Retzlaff <rtr%omicron-persei-8.net@localhost>]

I've just run pkg_chk -N and received the following output.

p5-Socket6: p5-Socket6-0.20
p5-INET6: p5-INET6-2.54
python24: python24-2.4.5
libtool-base: libtool-base-2.2
rsync: rsync-3.0.0 (probably better to wait for at least 3.0.1)
wget: wget-1.11.1

There are a few things I expect to appear in the above list and a few  
things I don't.

calculon:~> pkg_info -e wget
wget-1.11
calculon:~> pkg_info -e python24
python24-2.4.5

my PKGSRCDIR=/usr/2008Q1 and the system is NetBSD-4 running mostly  
2007Q4 packages (with some exceptions where updates to 2008Q1  
packages have already been done).

I was hoping this would answer the question of "what packages have i  
got installed that are from 2007Q4 that have an equivalent or newer  
version in 2008Q1?".  So that I could finish updating the rest and  
discard any 2007Q4 things I've been keeping.

the /usr/2008Q1/doc/TODO lists wget-1.11, python24-2.4.5 but if I  
already have these versions installed why is pkg_chk -N telling me  
they are candidates for update?

I'm probably just not understanding what the tool is supposed to do  
could someone please educate me.  Or if there is a better way to do  
what I'm trying to do I'm happy to hear it.

Thanks