2010 Mustang major changes:

Exterior Changes
Distinct Grilles and Fascias Unique to V6 & GT
Dome Hood, Fenders, Quarter and Door Panels
Headlamps Styling with integrated Park/Turn Lamps
Sideview mirrors
Swept Beltline Profile, Rear Quarter Window Trim
Rear Fascia, Decklid & Sequential LED Tail Lamps
Rear Quarter Mounted Radio Mast Antenna
LED Illuminated CHMSL
Lip Style Decklid Spoiler (GT)
Cloth Convertible Top with Boot Cover (Standard on GT Premium Convertible)
New 17", 18"& 19" Cast Aluminum Wheel Line-up
New Exterior Color Changes

Red Candy Metallic with Tinted Clearcoat
Grabber Blue
Kona Blue Metallic
Sunset Gold Metallic
New Interior Changes

One piece soft instrument panel
Modernized Center Stack I/P
Compass and Outside Tempature in Center Display
Center Floor console with Lockale Storage
Door Trim Panels
Ice Blue Lit Instrumentation
Seat Trim & Sew Pattern & Styling
Increased Seat Bolstering
Map Pocket on Rear of Driver & Passenger Seat
Interior Trunk Release
Covered Cup Holders
New Functional Equipment Changes

4.6L V8 engine with cold air induction along with Bullitt powertrain improvements on GT (315 horsepower with 320 ft-lbs of torque)
Auto Headlamp on all GT and V6 Pony Package
AdvanceTrac Electronic Stability Control (ESC) standard on all series
Easy Fuel Capless Fuel Fill on all models
Event Data Recorder (Black Box)
SOS Post Crash Alert System (Activates when Airbags deploy, Emergency flashers turn on, Engages horn and Doors unlock for quick exiting)
New Option Changes

SYNC Voice-activated Communication and Entertainment System with 911 assist and vehicle health report (Standard on V6 Premium and GT Premium)
19" Machined Aluminum Wheel (64X) mounted on P245/45WRx19 A/S tires available on GT Premium
19" Polished Aluminum Wheel (64V) mounted on P245/45WRx19 A/S tires available on GT Premium
Rear View Camera (77C), rear decklid spoiler mounted, available on GT Premium, V6 Pony Package (202A) or V6
Sport Exterior Package (201A)
HID Head lamps (51H) (Late Availability)
New Package Changes

Electronic Package - (58X) - (Availalbe on V6 Premium & GT Premium)

Includes:

Voice Activated Navigation System - In-Dash Screen & Single DVD/CD/MP3 Player, DVD Audio/Video Capability, Interanal Hard Disk Drive for Map, POI Storage, 10GB Jukebox, Support for SYNC & Other Multi-Media Devices (Audio Input Jack)
Includes 6-month SIRIUS Travel Link Pre-Paid Subsricption (service not availalbe in AK & HI)
Dual Zone Automatic Temperature Control
V6 Pony Package (202A)

Includes:

Unique bright pony grille with satin corral
Front lower fascia mounted fog lamps
Pony front fender badges
Lower door tape stripe, available in black and white
18" polished cast aluminum wheel, Tri-bar Pony center cap
P235/50WRx18 BSW A/S tires
Automatic headlamps
Premium carpeted front floor mats with embroidered Tri-bar Pony logo
Rear Deck Spoiler
Body color Exterior mirror
Unique chrome exhaust tip
3.73 Rear Axle Package (67T) - (Optional on GT coupe arrays with 5-speed, not available with Glass roof, not available with Shaker 1000)

Includes:

Performance 3.73 axle ratio
Dual piston frot calipers with performane brake pads
Recalibrated Electronic Stability Control (ESC)