(from the URJ site) Mishkan T’filah, the first new Siddur for the North American Reform Movement in more than thirty years. Including services for Shabbat, weekdays and festivals, as well as other occasions of public worship, and texts for more than a hundred songs, Mishkan T’filah reflects the full diversity of our Movement. This new Siddur includes:

• Broad selection of readings including beloved passages from our Reform liturgical tradition and great poetic writings from throughout Jewish history
• Faithful, elegant translations
• Contemporary, gender-inclusive English
• Theological and stylistic diversity
• Extensive commentaries, source notes and usage guides
• More than 100 contemporary and traditional song texts
• Choice of transliterated and non-transliterated editions
• Innovative design in two-page spreads (additional Shabbat services
  in linear style also included)
• Two-color printing enhances usability

Information

URJ has a lot of detailed information about the new prayerbook including an FAQ.  Refer to the Mishkan T'filah home page and the FAQ page.