The tax-code definition of a Roth conversion is a movement of funds from a traditional IRA to a Roth IRA. Movement of funds from a traditional account in a qualified retirement plan like a 401(k) is referred to as a rollover, not a conversion, even though many people apply the term "conversion" to both.
The tax code presently permits a rollover from a designated Roth account to a Roth IRA and there is no reason to expect any change to that The proposed legislation has been about making impermissible the conversion or rollover to Roth of after-tax amounts from traditional accounts, not restricting other rollovers and conversions.
