I'd try more drastic shade differences on that sprite - the idea is very good, I love the cyborgizations, the problem is - it's too flat imo, and hence the detail blurs on the tactical map.
As for the discussion... well, this turns my mind to the "darker side of XCom". The obvious implication of the game is, that the X-COM shares its technological secrets very reluctantly, if at all. One could argue that even without the Elerium, the technologies based on alien tech would allow the Earth military to strike back at some point, or at least make Earth's airspace impregnable to UFOs - when said technologies are deployed in sufficient number. Even more important would be purely industrial technologies - alloy shaping alone, when industrialized, would increase Earth's industrial potential manyfold, especially coupled with energy transmission and data processing upgrades (limitless energy from the sun might no longer be a pipe dream, and what about the fusion energy - man we have temperature-room superconductors now! This means almost no limit on electromagnet power...)
The XCom seems to be keeping a tight lid on these technologies, only selling them in small numbers, though. I think reasons are twofold:
1. If Earth was starting to gain a real fighting potential, it would become much less scared of terrorist attacks, and such a development would undermine the Alien position in diplomatic negotiations. People who are not scared won't be selling out as quickly, if at all. Such a state of affairs might force Alien hand to deploy strategic weapons - weapons of mass destruction, that is. The (I think) major reason of not deploying them - avoiding pushing Earth's elites into a fight to the death mindset - would not exist anymore, since they're already challenging the Aliens.
So in short, XCom wants to avoid the risk of wholesale genocide, should early Earth defense systems fail to intercept alien WMDs (and XCom knows nothing about the capabilities of these WMDs, so the risk is great).
2. And there is the "darker side". XCom is bound to have a coterie of sponsors - military, political and financial leaders who threw their lot with supporting the project. These men aren't charity. They also know that with a small fleet of Avengers and a host of alien tech (psionics!) they can control the Earth just as easily as the Aliens. So: get rid of the competition, start world domination (possibly with the US President as a frontman in this new world order). The events of TFTD seem to indicate that the plan succeeded, if only to a point: nation states are mostly gone, but the Earth is still divided into several competing blocs. More importantly, humans in TFTD have an access to very high technology, while their cities remind of run-down Detroit. A sure sign that the technology is elitist and there is a close-knit group in control. If the technology was industrialized and popularized, the cities would look very, very different.
In a nutshell: this is another reason to keep the tech hush-hush.
Keeping these in mind, there is semi-canon MiB organization, and the financial, political and military leaders who support it. And their objectives are clear as well: Earth is lost, what we need is a diplomatic solution. Plus, just like in point 2. of the previous group - elite-only tech, control of the Earth, if under Alien souveregnity. Aliens surely must not be idiots, they'd leave governing humans to other humans - humans like MJ12/MiB.
This leads us to an interesting idea. XCom should be not only fighting MiB - there is an obvious clash, casus beli between these two groups - but also intelligence services of the countries that do not want either scenario to play out. Countries who are underdogs and would like to industrialize the alien tech - either due to their strategical interests, or even partially due to their ideals - nation-states cannot survive without some sort of pro-social ideas, and the society would certainly want limitless electricity, cheap cars, better healthcare and kicing alien butts.
So the XCom would often, IMO, be involved in clashes with intelligence services of countries like Russia, China, India, Brazil, Germany, maybe even UK, looking to grab alien tech, nationalize it, mass-produce it and use to turn their nation-state into a superpower (and fight the aliens directly, too).