I own a Microkorg and must say that I'm not really impressed by the sounds the Monologue offers; it seems far too limited and doesn't have that deep punchy bass that the Microkorg offers. And it's a lot more expensive too. It makes me think of the iPhone 5C.
Given that it has digital memory I fear that live-twisting on the Monologue also will show artifacts, unless they increased the resolution a lot, but at least if you leave the settings alone it should avoid them. Having a sequencer compared to "just" the arpeggiator in the Microkorg is also nice.
But IMHO it's more important to look at the wider market: There have been tons of small-ish analogue synths in the last few years, in all sizes and price-points. On one hand, that shows that market interest is there, on the other it really will depend on how it compares to those to decide if it will be a success or not, since there are tons of alternatives.