One is hitting Australia next week, and I've been offered a loaner for a review, should I do it?
I'm already way behind on a whole bunch of videos, so I'd have to bump other stuff 
If it's really a limited series, does it make sense to review it in like 6 month when nobody can buy it anymore?
I thought only the MHO98 was limited... is the MHO900 limited as well?
We have to literally wait and see what is going on. At this moment Rigol churned out huge amount of models that is not going to survive on the market. Not all of them.
I would not bet what will survive here. Only time will tell. They seem to have no strategy whatsoever. It seems marketing department is making product decisions by randomly stabbing in a dark by looking into opinions from Internet.
If I were to venture a guess, this looks EXACTLY like someone is using ChatGPT (or some other AI) to analyze data from Internet and use that for decisions what kind of product to make. Without anybody checking if that makes any sense.
Also, from cheapest to most expensive scope in Gen3.x they all have exactly the same (not completely finished) software with same capabilities, that are not only less than competition but in some regards, less than their own older products. There is so much overlap in their own offering, that cannibalization is occuring.
And if you look at the market, it seems that to a critique of not best software and numerous complaints about it, they still released even more new scopes with it (without addressing any current issues). And to a question of sales that are not going well for reasons stated, they decided to address that by dropping prices.
And now this cringy "Limited Edition Gold" marketing campaign...
I remember several members here dreaming of hacking DHO900 to higher BW to be able to get close to 1GHz with single channel.
It seems Rigol took the critique of DHO900 having not enough sampling rate for BW, and also at the same time took that people want more BW and implemented mishmash of those two. So they once again created a scope that is again incapable of sampling at full BW at 4 Ch (again it violates Nyquist). So they replaced one 900 incompetent at 250 MHz for one incompetent at 1GHz. And they are targeting same crowd that don't actually care to use the scope just it looks cool and there are big numbers. Yeee...
If they could only control themselves and limit new scope to 350 or even 500Mhz that would be nice. But they cannot help it.
As to my prediction to imminent culling of the offering, I would just remind people to what happened in AWG area.
Several AWGs were released, and now are discontinued. Old DG1000Z is still on sale, but funny looking 800/900 series appeared and disappeared in course of few years. And it was abandoned with FW development and support.
User Manual stayed on V1.0 from 2019-08-29. Same as FW.
So you see, they develop product "just good enough" so it is kind of working but not fully ironed out. They release it, initially do some debug, temporarily keeping core development team together. After a year or so, they disband core team, and keep some capability to debug, but core team moves on to new products.
They keep making it as long as there is no need for further development, you just keep production line running.
P.S I just saw what Dave said about price. I you will be able to buy MHO900 at same price as now is DHO900, I think DHO900 is dead. If you get MHO900 350MHz version, that is better or same than DHO900 in every respect, but actually samples properly.