The only tablet I'll consider
Will be the Surface Pro.
1. It'll have a proper CPU so will run a full fat version of Windows meaning I can run the applications I need/want to when I'm away from my desktop.
2. I'll no doubt be able to link the peripherals I need from time to time to it such as an external DVD or hard drive.
3. It's lighter than a laptop/Ultrabook so transportation is easier.
4. It'll have a mouse and keyboard so I can actually do meaningful work on it unlike the iPad posers that can only post short messages to facebook and twitter because its too annoying but hey they feel good because they shelled out 500+ quid on it so it must be good.
Initially at least LTE will be for the moneybags like the Salesforce CEO and as others have said, smart business owners won't want the vendor lock in.
We already have the tools we need, that is VPN for offsite access to customer records stored on server cluster or if you really must use the marketing term 'the private cloud'