Heya folks :)
The URL datatype is now available on test.wikidata.org. It'd be amazing if you could give it some testing. We hope to roll it out on Monday however there are a few things outside our hands that still need review. It might happen that we have to delay it because of that until the next deployment in 2 weeks. Either way some testing would be great and useful.
When testing please be aware that URLs are right now not checked against the spam blacklist and that there is an issue with too long URLs.
Cheers Lydia