All eyes are on Apple Worldwide Developer Conference (WWDC) in San Francisco on Monday and whether Steve Jobs will unveil Apple iPhone 5. Most observers say Apple will not unveil the next generation iPhone though launch of the new power-packed iOS 5 is on the cards. A minority of analysts believe Apple will surprise everyone by revealing the iPhone 5.

However, a silent onslaught on iOS and iPhone is brewing in the Android world. A slew of Android devices slated to hit market are 4G-enabled, NFC capable, with some having ultra-high resolution cameras.

The endearing Android line-up has already caused apprehension in the iOS camp. Here is a quick glance at what is cooking in the Android camp:

T-Mobile is blazing the summer Android launch trail by announcing the HTC Sensation 4G, Samsung Gravity Smart and Samsung Exhibit 4G in quick succession. while HTC Sensation 4G will be released on June 15, the other two hand sets will also come sometime this month.

Sprint has lined up three handsets, HTC Evo 3D, the Motorola XPRT, and the Motorola Titanium. While the XPRT will arrive on June 5, the other two are likely to come in the near future.

AT&T was up to speed by the announcement of Android-based Pantech phone Crossover. To be available on June 5, it will come at $69.99 with a two-year agreement.

Though Verizon appears not to have any earthshaking smart phone announcement to make, it has showcased 4G LTE version of the Galaxy Tab 10.1.

And then there is talk about HTC Evo 3D. Leaks suggest HTC is mulling the release of the new Android phone on AT&T and T-Mobile.

A report by said a smartphone similar to the HTC Evo 3D appeared in one HTC Developer website. The phone reportedly had two cameras.

In the tablet sphere, the new arrival will be the 7-inch ViewPad 7x slate from ViewSonic. This will be run on Google’s Honeycomb platform.

The highly portable device weighs only 380 grams and looks like it can fit in a back pants pocket or inside jacket pocket, according to a review in Gigaom. ViewSonic integrated an HSPA+ mobile broadband radio in the ViewPad 7x, so it can connect to the web wherever there is cellular data coverage. ViewSonic unveiled ViewPad 7x slate at the Computex trade show last week.