First this is not a personal attack on anyone, but I have to say that ALL of us bought this device well knowing that some of the features were still in developement. I have not seen anyone present actual evidence of Motorola committing to any specific dates as to when these features would be added. If you have evidence please share as I am sure there are many people who would like to see it.
Moto was first out of the gate with a HC tablet, if they had waited until everything was done it still would not have shipped and the same people who are blasting Motorola now for unsupported features would be the same people screaming that they were late to market. The US Xoom is a GED device, so the SD support is fully in Google's hands. As for the LTE upgrade, I have a WiFi Xoom so I really can not comment any more than what I have already said. In this type of market there really are not too many options.
1) Ship something with less features to be first or earlier to the market
2) Wait for the features to be fully supported and be late to the market
3) Ship the unit with full hardware support but lacking full software support so that features can be enabled in future SW updates.
It comes down to which one of these options satisfies the most people. I personally think they made the right choice, but everyone is entitled to thier own opinion. Now do I believe Moto needs to reduce the pricing to compete, of course. But I am sure that as soon as they reduce prices, people will be bitching about that too. There is ALWAYS a premium for buying the first of anything, especially in the technology market.
Me personally, I like my Xoom and after reading reviews of the Samsung given the option to choose I would stick with the Xoom. Is it heavier - absolutely, is it more robust/durable - absolutely, is it going to get Adroid updates faster and for a longer period of time - most likely.
Regarding the point of them already designing a next generation Xoom, that is what companies have to do to stay competitive. There will ALWAYS be something newer/better/cheaper on the horizon and I would be more pissed off if they were not working on the next best thing.
Does it suck that something we all just spent good $$$ on a few months ago is not the "best" thing anymore, sure but that is how it goes.