Besides the 680 there are two more releases from Garmin for the Nuvi line of GPS receivers, Garmin nuvi 370 and nuvi 670. You can read the press release here.
Some of the notable features of these new GPS receivers include the integrated traffic receiver and the hands free calling feature using Bluetooth Wireless Technology capabilities and integrated microphone and speaker.

Garmin Nuvi 370 Specifications

• Receiver: high-sensitivity WAAS-enabled GPS receiver
• Display: 2.8” W x 2.1” H (3.5” diag.), 320 x 240 pixels; bright, TFT display, 64K colors, with white backlight and touch screen
• Unit dimensions: 3.87″ W x 2.91″ H x 0.87″ D (9.83 cm x 7.39 cm x 2.21 cm)
• Weight: 5.1 ounces (144.6 grams)
• Battery: Rechargeable lithium-ion battery, 4-8 hours of battery life depending on use
• Bluetooth wireless technology for hands-free calling
• Alerts for traffic, road construction and weather-related tie-ups. nüvi 660 uses data to suggest alternate routes before problems are encountered
• Includes Garmin Lock™, an anti-theft feature
• Voice announces streets by name
• Preloaded maps for all of North America and Europe
• Fingertip touch-screen interface
• Look up addresses and points of interest
• Choose 2D or 3D maps
• Upload custom POIs, including alerts for speed zones and safety cameras with POI Loader
• Built in Travel Kit includes MP3 player with sample MP3s, audio books, picture viewer, world clock, currency and measurement converters, calculator and more
• Add optional software such as Travel and Language Guides to personalize nüvi
• SD card slot
• USB interface for loading data

Pricing and Availability

The Nuvi 370 is expected to start shipping in the 1st quarter of 2007 with a suggested price of $964.27

Garmin Nuvi 670 Specifications

The 670 has similar specifications with its little brother, the main differences include

• Display: 4.3 diagonal, 480 x 272 pixels; WQVGA TFT landscape display, with white
  backlight and touchscreen
• Unit dimensions: 4.9”W x 2.9”H x 0.9” D (12.4 x 7.4 x 2.3 cm)
• Weight: 6.2 oz (190 g)

Pricing and Availability

The Nuvi 670 is expected to start shipping in the 1st quarter of 2007 with a suggested price of $1178.56