I wonder how iPhones will manage when new regulation comes in requiring banks to record all mobile conversations. Can iPhones run two apps at once? (I heard they can't) Or will iPhone-loving banks have to ban all business transaction conversation on the mobile? 

"Push email" - or the ability to receive emails in the background without needing a log on to the email application - is the hallmark of BlackBerry and probably contributed to its success. At the same time, it made it addictive ("CrackBerry"), wrecked business meetings and sowed the seeds of many a marital discord.

Deutsche Bank's move makes me wonder if companies and their employees are signaling a strong urge to restore work-life balance by choosing a platform like iPhone that lacks push email. 

in regards to the lack of Push email - this is down to the deployment of a sand boxed App on the iPhone rather than using the native email client on the phone. The iPhone does in fact have push email capability when linked directly to the exchange servers. Its a case of weighing up the security - the Sand boxed App approach stores no data locally but you don't get push; direct exchange connection potentially leaves sensitive information on the device.

As outlined in my blog post, this is a trial of connectivity to potentially numerous devices rather than a trial of integrated iPhones in the enterprise. 

Could a Citrix-type enterprise cloud solve the enterprise control issues with the iPhone? 

have been hearing a lot on 'Customer Experience' and few interesting bits fesp from IPS2012, its a no surprise that banks 'internal customers/employees' are considered for using thier mobiles. Most employees (esp in UK) would anyways have 2 handsets BB and an iphone, and may provoke them to have one instead. Though push mail is possible (I have used it), orgs cannot impose restrictions like mandatory lock/pwd on an iphone (no enterprise server!) which i am sure apple would come up soon controlling through iTunes Enterprise Server!