WP 1.5 theme designers, please note:

I tried installing some new themes for WP 1.5 (2005/01/16 nightly build) and after applying them to my blog, I discovered they weren’t working.
Why?
I got this error:
“Call to undefined function”
for these functions:
<?php get_header(); ?>
<?php get_footer(); ?>
I discovered that these commands need to bechanged with an include function, like this:
<?PHP include (“header.php”); ?>
(This one is for the title)
So if you are going to design new themes, please update those trings of code that are needing to be updated…
TO DEVELOPERS:
Have I written something wrong?
Please, feel free to correct me: I have just a small nit of empiric knowledge of php.
Could you also post somewhere a changelog for the new version? Or is it too early?