Google‘s (NASDAQ:GOOG) shareholders undoubtedly would love to sing the praises of the $12.5 billion acquisition of Motorola Mobility (NYSE:MMI), but the big buy inspires more worry than excitement at this point. There are simply too many serious challenges facing Googerola (Motoogle?), too many questions with murky answers at this point.

What will happen to Google’s smartphone partners like HTC, whose phones regularly outsell Motorola’s through telecoms like Verizon (NYSE:VZ)? Will Google keep the best toys for itself and release advanced versions of the Android operating system on its Motorola devices ahead of manufacturing partners? Will the FTC even allow the acquisition to go through?

As Stifel Nicolaus analyst Rebecca Arbogast told All Things Digital on Tuesday, even if Google’s hardware partners are “enthusiastic” about the Motorola deal, that doesn’t mean they won’t seek out government protection from discriminatory treatment. The deal will give Google control of nearly 20,000 Motorola patents, but that might not protect the company from the litigation-happy Apple (NASDAQ:AAPL) as much as the company might want.

To convince its shareholders and competitors of this massive acquisition’s merits, Google needs specific things. Namely, it needs to show off new gadgets as soon as possible — a new wave of hardware that is both sexy enough to draw out consumers and original enough to protect them from patent infringement lawsuits.

Here are the devices in Google’s future that are worth $12.5 billion:

Xoom 2

The Xoom tablet hasn’t exactly been the revolution Google and Motorola thought it would be when it released earlier this year. The device hasn’t just been steamrolled by the iPad, it’s been left behind every other tablet on the market that’s fighting for the iPad’s table scraps. While it likely won’t be called the Xoom 2 (the brand is a non-starter at this point), Google and Motorola are guaranteed to release another tablet, likely before March 2012.

First and foremost, the new device needs to be cheap. The low-cost Xoom debuted at $599 in March, $100 more than the cheapest iPad, and that price sealed its fate from the start. It also needs to be sleek but original, a device that can be easily discerned from the iPad so the public can recognize it and so it can be protected from patent infringement attacks. It’s a tall order, but this will be the device Motorola and Google focus on at CES in January.

New Google TV

The discussion surrounding Google’s Motorola purchase so far has largely been focused on its implications on the smartphone market. Of course, this forgets that Motorola’s business will allow Google an in to a market it has been trying to break into for two years — television.

Google TV, the company’s Internet television software for set-top boxes, has been a failure so far, but Motorola’s expertise in the field will give Google a fighting chance the next time around. Motorola’s cable set-top box business generated $907 million in sales last quarter and operating earnings of $67 million. Google TV now has the Trojan horse it always has needed to get a foothold with consumers, and it will prove a major component in the success of the acquisition.

Next Nexus

This is the $12.5 billion mystery. HTC co-developed the first Nexus, the “Official Google Phone,” and Samsung (PINK:SSNLF) made the Nexus S, its successor. Thing is, Motorola’s Droid handhelds always have been more closely identified with Google’s mobile operating system, so it’s appropriate that it now will be the partner behind the next official Google phone. What that device will be, however, and how it will compare to Apple’s juggernaut iPhone, is the million-dollar question.

If it’s smart, Google won’t chase Apple’s luxury market. Steve Jobs has a lock on the big spenders. Google has an opportunity to make a feature-rich device that also is exceptionally affordable. That will be how it wins this battle, not to mention how it will justify a single corporate purchase around seven times greater than its landmark acquisition of YouTube.

As of this writing, Anthony John Agnello did not own a position in any of the stocks named here. Follow him on Twitter at @ajohnagnello and become a fan of InvestorPlace on Facebook.