After my last trip through SEA all I know is I'll be trying to pick flights with more than 90 minutes of connection time going forward. Flight coming in from Anchorage was only a few minutes behind schedule, but we spent what felt like 30 minutes taxing to a D gate. Lucky for me, the connection was also a D gate, but it was one of the new bus gates. Made it over just as the final boarding group was being announced. If it had been a connection to any other terminal I would have been out of luck I think...