Sorry Mitchel, but you are wrong, only responsibility for the module has been transferred to the core, represented by Shaun Walker.
Text/HTML has been converted to a WSP module, i.e. source code is always included (code behind in /desktopModules/HTML, for classes see /app_Code/HTML folder) and compiled on demand with the web site. This means any change in the contained .vb files is effective immediately.
Anyhow, the Text/HTML module is part of any .dnn installation package and will overwrite your changes, therefore I suggest to create a copy in a renamed folder, rename classes and module name, to create your own fork of this module.