that seems (astonishingly) to have captured some corners of the Lutheran Blogosphere. Being an LSB man myself (that is, one who believes in allowing our official liturgy to put a check on Weedon's own personal preferences), I'd note that it is not a slam dunk either way. For, though the Altar Book ignores the use of rose for Gaudete and Laetare, it IS mentioned as an option in *The Altar Guild Manual* (see page 27).
My brothers, this is truly a "machts nichts" matter. The very manner in which the colors were employed across Church history (including centuries in Lutheran history) is anything but uniform. If your brother uses rose paraments and vestments upon Laetare and Gaudete, rejoice with him - and remember not to call them pink! If your brother retains violet (or in Advent, perhaps blue) paraments upon those days, rejoice with him! Surely THIS is the very definition of an adiaphoron? "And whatever you do in word and deed, do it all in the name of the Lord Jesus Christ, giving glory to God through Him."