Update iOS 4.01/iOS 4.1 Due to jailbreak ?

According to a tweet MaxdMerc, working at the Apple Store in Lakeside, updating the iOS 4 which was scheduled to appear had to be delayed given that Apple is working on a fix following the recent jailbreak iOS 4 and after the various demonstrations of the Dev Team's jailbreak on the iPhone 4.
Anyway, we know that each update blocks the jailbreak!

A rumor that confimr by another employee of another Apple Store, Sportycos.

The iPhone 4 was the launch of the most successful product in Apple's history. It was considered by reviewers around the world to be the best smartphone ever, and users have told us they love. We were therefore surprised when we read reports of reception problems, and we immediately started to investigate this matter. Here's what we learned.

For starters, almost any mobile phone in some ways to reduce its receipt by one or more bars. This is true for the iPhone 4, iPhone 3G, and many Droid, Nokia and RIM. But some users have reported that the iPhone 4 can have down 4 or 5 bars when well conducted in a manner which covers the black stripe in the lower left corner of the metal strip. This fall is much larger than normal, and therefore, some have accused the four iPhones have a defective design of the antenna.

At the same time, we continue to read articles and receive hundreds of emails saying that the reception is better than the iPhone 3G. users are delighted. This corresponds to our own experience and testing. How to explain this?

We have discovered the cause of this dramatic drop in bars, and it is both simple and surprising.

After investigation, we were amazed to see that the formula we use to calculate many bars of signal strength to be displayed is completely false. Our formula, in many cases, incorrectly displays, two more bars than they should for a given signal strength. For example, we sometimes display 4 bars, so we should see as little as two users bars.Les observing a drop of several bars where taking their iPhone in some ways are more likely in an area where the strength of very weak signal, but they do not know because we are in error: 4 or 5 bars. Their sharp decline in their bars because bars have never been real high in the first place.
...
We will publish an update of free software in the few weeks that includes the corrected formula. Given that this error has been present since the original iPhone, this software update will be available for the iPhone 3G and iPhone 3G.
...
As a reminder, if you are not completely satisfied, return your iPhone intact in any Apple Store or Apple Store online within 30 days of purchase for a full refund.

We hope you like the iPhone 4 as much as us.

We appreciate your patience and your support.

Apple

This concern appears to be present also for the iPhone 3G and 3G, so these models will also TECNICONTROL for updating the iOS 4.
The iPod Touch does not seem to concern this software update.
This will probably the update iOS 4.0.1
Remember that in September, a big update of iOS 4 is also planned to integrate the Game Center.

So users jailbroken and unlocked especially should stay away from this future update, the baseband (version prog. Modem) will surely be changed to bridge the rift that uses Ultrasn0w.