A few remarks:
- only 2 channels? 
I Agree, there should be a four channel model, but that seams unlikely based on the pictured front panel.
- no logic inputs?
I guess the inputs for any future MSO option will be inside the rectangular area right from the USB port.
How is this going to compete with Rigol and who is going to buy it anyway after the SDS2000 debacle? The SDS2000 is still incomplete and buggy and it has been 7 months since the last firmware update.
Indeed. I have no doubt that this scope will be made of decent hardware, however Siglent's track record in terms of firmware has been terrible so far. 7 months without any updates is a clear sign that Siglent has essentially given up on the SDS2000 and moved on to new products, which I'm sure will again released prematurely with tons of bugs of which some may get fixed later, all while breaking other functionality.
I'm not a big fan of Rigol kit and Rigol does have their fair share of firmware issues themselves, however they seem much more active in sorting the worst problems out than Siglent.