Does that mean that express edition is merely a trial edition now? Or am I misreading something?
Trial Edition. The initial installation of the software is a trial edition. You may convert your trial rights at any time by obtaining a product key from Microsoft. The trial software will present conversion options to you thirty (30) days after you install the trial software. After the expiration of the 30-day trial period, without conversion, the trial software will stop running.
edit: nm, it says on another page:
So it looks like its still free and just requires registration.
After installation, you can try this product for up to 30 days. You must register to obtain a free product key for ongoing use after 30 days.