I noticed WordPress’ version number has made a jump from 1.3 to 1.5. At first I thought it a typo or something. Then more discussions went on. The developers didn’t change the version number back to 1.3 too in their nightly builds. It was then I figured more or less that 1.5 is the upcoming version number for WordPress and not 1.3. [More information.]
The real reason is we wanted the version to be indictative of the changes in the underlying codebase, and 1.5 has a lot. WeÃ¢??re still pretty conservative with version numbers though, if we were Microsoft weÃ¢??d be on 10.0 already.
Source: WordPress > Development Blog
This blog that you’re reading runs on WordPress 1.2.1 and has yet to upgrade to 1.2.2. It would be real soon though. I won’t be jumping into 1.5 Alpha, since it’s in the, well, alpha state. I’ll jump into it as it reaches beta though. I really want the ability to add pages and theme management.