For a potential new VE Pro purchaser like me, it is 50 euros less to pre-order.Based on my experience with Synchron Strings, I would recommend not pre-ordering anything from VSL. Wait for VE Pro 7 to be released, and try the demo.
Epic Orchestra 2.0 isn't a comprehensive collection, and being able to download it now isn't a compelling reason to pre-order VE Pro 7 except for the most sample-starved composer. And if you're a sample-starved composer, you probably don't need VE Pro in the first place.
As it comes with a copy of VE Pro 6, I don't see the risk.