Ultimaker Unveils New Ultimaker 3

[curious aardvark]

but it is a good machine for professional use because of the reliability - failed prints and repairs can be major bottlenecks for a business.

I don't get those either on my £500 flashforge.
That is more down to best practice than any particular machine.

As fas as the linking many machines together goes, that's down to software - you can stack any 3d printers as long as you've got the right software.
For multi printing there are a number of really clever machines doing this much better. Bnc3d have sub £3000 printers with dual independant printheads. Two different things at once right out of the box.
Then there are several companies using multi feed single nozzle mixing systems, again available for under £3000.

I'm not saying ultimakers aren't good printers - they are. But this new one, just doesn't justify either the price point or the ridiculous advertising statements.