Following in the footsteps of the Xperia Z2, the Sony Xperia Z2 Tablet is available for pre-order. We made the rounds and collected the prices of the tablet around Europe. The launch date will be in April, the same time frame as the the Z2 phone.
The good news is that it's cheaper than the phone in most places in the UK, it's £500 (€610) both from Sony's official web site and from Clove UK. This is for the 16GB Wi-Fi only version.
The price in Germany is €500 (and €650 from Sony's official web site). Note that these are pre-order prices and might change in time for the launch. The 32GB Wi-Fi model is €550, the 16GB LTE model is €650.
In France and the Netherlands the Xperia Z2 tablet is €630, €670 in Sweden (SEK 5 995,00) and €700 in Spain and Poland (PLN 2 899). These prices are from the official site, so it's possible that regional stores have it cheaper (like in Germany). If you find such a store, drop a link in the comments!