Of the four major national networks in the US, Sprint has been the most faithful in its commitment to offer unlimited data plans without restrictions. After this morning's announcement that the operator would be rolling out Spark, which promises 50-60Mbps peak speeds (with faster networks on the horizon as part of its Vision) to its users, it left us wondering if this rollout would come with any trade-offs. While he didn't speak to specifics on plans and pricing, CEO Dan Hesse reaffirmed his company's commitment to unlimited data, explaining that he wouldn't have offered Unlimited for Life to customers this summer if he didn't intend to keep the plans around for the foreseeable future. This will be great for the limited number of markets that can take advantage of the blazing speeds right away, but anxious folks in other parts of the country can at least take comfort in knowing that the plans won't have gone anywhere when Spark finally shows up in their hometown.