Today's Tech: Google to launch Nexus 5 and new Nexus 7 at I/O conference, Samsung tips 5G for 2020, and Sony debuts Xperia ZR

Google I/O 2013 kicks off in just two days, and the tech media is itching to find out what the search giant has to offer. Perhaps a new, low-cost Nexus 7 tablet? Or a Wallet update that ditches the proposed physical credit card? According to various reports, both are expected at this week's event. Apparently, the new Nexus 7 tablet will come with a 7in, high-resolution 1,920 x 1,200 pixel touch-screen; the existing model comes in at 1,280 x 800 pixels. The new Nexus 7 will also have a 5-megapixel rear camera, a Qualcomm APQ 8064 processor, and wireless charging, while the next Google tablet will also be thinner and lighter - making the new Nexus 7 a legitimate Apple iPad mini rival. There's also considerable chatter about the potential launch of the Google Nexus 5 handset, after a leading High Street retailer was noticed to have yanked the Nexus 4 from its inventory.

Not content with offering one of the most coveted 4G smartphones in the land, Galaxy S4 manufacturer Samsung is looking to dramatically up the ante in the mobile network sweepstakes via a lightning-fast 5G platform that could be available to consumers as soon as 2020. According to South Korea's Yonhap News Agency, Samsung has confirmed the successful testing of a 5G network, reporting that the trials produced dizzying speeds of 1Gbps - a rate that would allow users to download entire HD films in seconds. To put the 1Gbps mobile broadband breakthrough into perspective, it's the same whirlwind pace offered by the Google Fiber project, which is being trialled in the United States to the delight of select homeowners and businesses. The difference, obviously, is that Samsung's breakneck speeds will be coming direct to your handset - follow the link for more on the 5G breakthrough.

One of the most eye-catching smartphones of 2013 has been the Sony Xperia Z, which immediately drew intrigue for its water-resistant credentials that added a touch of spice to a strong spec-sheet. Five months on from its unveiling at CES, Sony seems convinced that dunking your phone underwater is something of a necessity, having today launched the Sony Xperia ZR that promises even more liquid durability than its predecessor. The Japanese manufacturer says the Android-running ZR features "the highest level of water-resistance for capturing photos and Full HD videos underwater," which sees the handset operational when submerged at 1.5m for up to 30 minutes - follow the link for more on the ultra-desirable Xperia ZR, including full specifications.

IBM is set to showcase its involvement in energy conservation and community-building projects in Chale, Isle of Wight, as part of the Be The Start sustainability campaign. The month-long environmental awareness drive is jointly organised by Start UK and Business In The Community, and features a range of leading organisations, each of which takes centre stage for a day in May to highlight its green initiatives. Global technology giant IBM steps into the spotlight on 14 May as a focal point of 'More Vibrant Communities' week and will highlight its work in Chale, a village and civil parish on the south coast of Isle of Wight. Indeed, in conjunction with its Smarter Trends green tech site, IBM is hosting an energy efficiency Twitter Q&A on 14 May, where the likes of IBM Master Inventor Andy Stanford-Clark will be on hand to answer your questions. For more, follow the link and read the full future on "The ripple effect of Smarter Energy: IBM's Chale success story in the spotlight."