The Bundesautobahn 571 (A571) is a relatively short highway in Germany that connects the town of Bönnigheim to the A81. As for extensions or upgrades planned for the A571 until 2015, it appears that there were no significant extensions or major upgrades reported during that time frame.

Historically, the focus has been more on maintenance and minor improvements rather than large-scale expansion projects. For the most accurate and detailed information on specific projects, you would typically consult local government transportation plans or reports from the German Federal Ministry of Transport and Digital Infrastructure.

If you are looking for more current updates or specific future plans beyond 2015, it would be advisable to check the latest reports or announcements from the relevant authorities.