According to the 2013 portfolio number, the D2005 is the Xperia M dual successor (C2005), the D2105 is the Xperia L successor (C2105) and the SGP521 is the Xperia Tablet Z successor (SGP321).
The numbers that registered earlier is also an unannounced model. The D5322/D5303 is the Xperia SP successor (C5302/3/C53XX) and the D6503 is the successor of the Xperia ZL (C6503). The D5503 model number is the Xperia Z1 mini (successor of Xperia ZR - C5503).
OK, we are now going to the benchmark section. XperiaGuide is leaking a few Xperia models that are announced in 2014. They're D6503, D5303, D2105 and D2005. As listed above, the D2005 may be a successor to Xperia M (dual) (C2005) and the D2105 could be a successor of Xperia L (C2105). The D5303 may have a MediaTek MT6592 1.7GHz octa-core SoC and a 6" screen, but is a rumour only. Hopefully we can see these device in CES 2014 or MWC 2014.
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