There is no convenient way to specify output files for vstest.console.exe. The application generates arbitrary output names for every run like:
Results File: D:\Projects\Component\TestResults\username_MACHINENAME 2014-03-31 18_27_07.trx

Attachments:
D:\Projects\Component\TestResults\e78e4dbd-5664-44de-a32b-91c312c1f7ad\username_MACHINENAME 2014-03-31 18_26_52.coverage

It will be fine to make those file paths available for next build steps.