Hey folks,
we will soon change how Wikibase outputs data as Wikitext per default. This might affect users of the "action=wbformatvalue" API that either use "generate=text/x-wiki" or omit the "generate" parameter (Wikitext output is the default for that API module). I briefly looked through our API logs in order to see how many users will be affected by this and found that no one uses this feature[0].
Please note that for our internal functionality (like the property parser function, or the Lua functionality), we made sure that the output wont change.
Only the output obtained via the wbformatvalue-API module might change!
Cheers, Marius