UC500.com Cisco CallManager Express, UC500 reference

Saurabh V a TME at Cisco gave me the following information regarding the new IP phone models.

The new Cisco Unified IP Phone 500 Series models are orderable and have
begun shipping.  The 521G model (CP-521G=) has a list price of $149.00
(US), and the 524G model (CP-524G=) has a list price of $189.00 (US).
These phones are now available on both the Global Price List and the
Wholesale Price List, and can be ordered through the Cisco Ordering
Tool.  There are also some accessories for these phones which will go
orderable in about a week - CP-500-HANDSET= ($15 US List),
CP-500-WALLMOUNT= ($25 US List) and CP-500-PWRSUPPLY= ($25 US List). 

Product Overview
The Cisco(r) Unified IP Phones 500 Series are a new set of affordable,
entry-level IP phones that provide full feature functionality, purpose
built for use with Cisco's Unified Communication 500 Series platforms.
These phones are an excellent choice for customers undergoing the
transition from traditional digital or hybrid key systems (KTS) and PBXs
to the Cisco Unified Communication 500 Series system.  The Cisco Unified
IP Phones 500 Series can be easily integrated into the Cisco Smart
Business Communications System using Cisco Configuration Assistant
(CCA).  These phones can be used by SMBs in cubicles, retail settings,
classrooms, breakrooms, lobbies, and manufacturing areas.  Additionally,
the phones are optimized for solution deployments to replace traditional
voice systems, or to layer a next generation voice solution into a CAT5
wired environment.

The Cisco Unified IP Phone 521G is a single-line IP phone with two call
line appearances.  The Cisco Unified IP Phone 524G is a four-line IP
phone with up to eight call line appearances.  Four dynamic soft keys on
each phone guide you through core business features and functions, while
a backlit pixel-based display combines intuitive features, calling
information, and device system information to give you information at
your fingertips. The Cisco Unified IP Phones 521G and 524G can be
powered by a network switch with Power over Ethernet (PoE) capability or
can use an optional power adapter.  The phones are inline with Cisco
Green, incorporating power efficiency technology features such as LCD
shut-off to save power when the phone is not in use.  Finally, the Cisco
Unified IP Phones 500 Series can also be used with unified
communications productivity-enhancing features such as directory search
and VoiceView Express.

The Cisco Unified IP Phones 500 Series can be sold by Cisco Partners who
are Select Specialized or higher, and can be supported by Cisco TAC via
SMARTnet contract.

Please note that in order to support these new phones, customers will be
required to update their existing UC500 unit to IOS 12.4(11)XW7, and
must download CCA 1.6 in order to configure them.