I’ve got this information from a new source. Take it with a grain of salt… but we will very soon be able to see if the source is correct:
The new XF 18-135 will be officially announced on Memorial day (26th of May).
The price, as spotted by FR-reader MJr, could be $/€200 above the [shoplink 12887]XF 18-55mm[/shoplink] (at least as listed at the Dutch store artencraft).
If true, stay tuned for a live blogging session on that day here on Fujirumors.