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Xperia Arc 2.3.4 (4.0.1.A.0.283) Update Available for both LT15i LT15a (thanx BR4DOKYBrazil for the link and XDA forum datagubben for the file)
http://forum.xda-developers.com/showthread.php?t=1269910
Global Generic version
http://forum.xda-developers.com/showthread.php?t=1269937
LT15a (american version)
http://forum.xda-developers.com/showthread.php?t=1319764
Here are some screenshots/pictures:
I have the new firmware 4.0.1.A.0.238 LT15i updated via PCC today.
Seems snappier (wishful thinking).
3D panorama (Did not work yet for me).
3D gallery app.
Screenshots in power menu.
New time widget.
Facebook share integration stuff.
Swype keyboard.
Here is 4.0.1.A.0.238 Nordic_Telia.ftf for flashing:
get the Flashtool From here
http://forum.xda-developers.com/showthread.php?t=920746
Install it and you will see 5 folders
Custom
Drivers
Firmwares
Loaders
X10Flasher_lib
take the firmware to the "Firmwares" folder
click on Falsh
Press Ok
it will ask you to connect your phone on Flashmode (turn off your phone, press the back button, then connect the USB) press OK
This is an step by step guide
Ok , but , When!!?? thats is the question !!! , when sony will started to updrade the ICS on ARC ?
it should be by the end of this month
WE ARE ON THE END OF MAY !!!
you don't need to SCREAM!!! we are not at the end of may yet, we have this and next week.
we r the end of may. They might be update
you are posting on the wrong thread, the update was released and it will eventually get to all the SI numbers.
"
If you find your SI in the released software table the software for your device is released and available in PC Companion and Bridge for Mac where you can update your Xperia™ Smartphone.
We will continue to add items in the list as soon as they are released.
We will however not be able to answer on questions like: "When will SI number XXXX-XXXX be added to this list?" or "when will country X get the update?"
"
Don't forget to mark the Correct Answers & Helpful Answers
nous sommes le 16 juin 2012 et je cherche toujours la version ICS pour mon Xperia ARC LT 15??
Si quelque peux m'aider ..... j'ai evidemment essayé PC companion qui me dit que j'ai la dernière version, idem avecc "Update service "
merci d'avance
Hey Jason,
I also have an xperia arc with Rogers but still havn't received the update yet. What is your SI number?
Hy Guys
I'm waiting the update for my xperia arc.
Are you sure every Arcs will get the update?
My SI until now there isn't in the damned list! 
Hi!!!
I have the same problem because my SI number is not in the list
How much i have to wait???