According to the FujiRumors web site, the Fujinon XF18-135mm f3.5-5.6 R OIS WR lens could be announced as early as May 26th which in the US is Memorial day but here in the UK it is the Late-Spring Bank Holiday
Their blog post can be read here.
The price will probably be somewhere in the region of £650 to £700.
Lets hope that Fujifilm honour the vouchers that we got with our X-T1 cameras:
This will bring the price down to around £400 to £450 which is a bit more manageable. Note that sticker says that the offer ends on 31st August 2014 so the lens must be available some time before this date, this lends some credence to the rumour. The recent Fuji X-T1 cameras no longer have this sticker on their boxes.