Wait -- are we sure this has anything to do with E60s? My reading of the article was that an existing order for 40-footers was changed to 60-footers, but it's not clear that they're electric trolleys (in fact, one article calls them "motor coaches": http://sfbay.ca/2014/10/01/sfmta-lands-grant-funds-for-new-muni-buses/). Also, there are more than 12 E60s to replace, right?
Of course, replacements for the E60s are coming, but maybe a little later (http://www.fleetsandfuels.com/fleet-order/2013/08/seattle-and-san-francisco-trolley-buses/).