By Nathan Olivarez-Giles Pebble announced its Pebble Time smartwatch a week ago and it won’t start shipping until this May. But the Palo Alto startup is already introducing a higher-end version of the new watch, called Pebble Time Steel. Like the original Time, the upgraded version is being made available for pre-orders on Kickstarter.Functionally, the Time Steel is the same as the standard Time watch--it doesn’t do anything the cheaper model can’t.