Google has officially announced it will no longer offer official compatibility of Google Analytics with Internet Explorer 8 at the end of 2013. You can read the announcement here: Supporting a Modern Browsing Experience.
What does this mean? It means that Google Analytics will plan to roll out newer features that IE8 will not be able to support. IE8 was officially released in 2009 and is simply not adequate to keep up with the capabilities of modern browsers like IE9, IE10, Chrome, Safair, Firefox, and even Opera. Google stopped supporting Apps on IE8 last year and this is the next step in keeping their products moving forward. This announcement does not mean your Analytics numbers will be affected, but instead that using IE8 to view your Google Analytics information will change at the end of the year. More than likely there will be newer features for the GA dashboard coming in 2014 that will change the User Interface we are accustomed to.
If you are currently using IE8, I would recommend either upgrading to a modern IE like 9 or 10, or to use a modern browser like Chrome or Firefox moving forward.
For any user that is still on Windows XP, IE8 is the furthest upgrade you can do in the IE browser line. Windows XP as an operating system is not able to handle the features built into IE9 and IE10, so you will want to look into Chrome or Firefox.